minor guide fixes for consistency (#16273)

docs/guides/http/hot.md

@@ -5,18 +5,22 @@ name: Hot reload an HTTP server
 Bun supports the [`--hot`](https://bun.sh/docs/runtime/hot#hot-mode) flag to run a file with hot reloading enabled. When any module or file changes, Bun re-runs the file.
 
 ```sh
-bun --hot run index.ts
+$ bun --hot run index.ts
 ```
 
 ---
 
 Bun detects when you are running an HTTP server with `Bun.serve()`. It reloads your fetch handler when source files change, _without_ restarting the `bun` process. This makes hot reloads nearly instantaneous.
 
+{% callout %}
+Note that this doesn't reload the page on your browser.
+{% /callout %}
+
 ```ts
 Bun.serve({
   port: 3000,
   fetch(req) {
-    return new Response(`Hello world`);
+    return new Response("Hello world");
   },
 });
 ```